[deliverable/linux.git] / drivers / s390 / cio / device_status.c

/*
 *    Copyright IBM Corp. 2002
 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 * Status accumulation and basic sense functions.
 */

#include <linux/module.h>
#include <linux/init.h>

#include <asm/ccwdev.h>
#include <asm/cio.h>

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
#include "io_sch.h"

/*
 * Check for any kind of channel or interface control check but don't
 * issue the message for the console device
 */
static void
ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
{
	struct subchannel *sch = to_subchannel(cdev->dev.parent);
	char dbf_text[15];

	if (!scsw_is_valid_cstat(&irb->scsw) ||
	    !(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK |
	      SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK)))
		return;
	CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
		      "received"
		      " ... device %04x on subchannel 0.%x.%04x, dev_stat "
		      ": %02X sch_stat : %02X\n",
		      cdev->private->dev_id.devno, sch->schid.ssid,
		      sch->schid.sch_no,
		      scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
	sprintf(dbf_text, "chk%x", sch->schid.sch_no);
	CIO_TRACE_EVENT(0, dbf_text);
	CIO_HEX_EVENT(0, irb, sizeof(struct irb));
}

/*
 * Some paths became not operational (pno bit in scsw is set).
 */
static void
ccw_device_path_notoper(struct ccw_device *cdev)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	if (cio_update_schib(sch))
		goto doverify;

	CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
		      "not operational \n", __func__,
		      sch->schid.ssid, sch->schid.sch_no,
		      sch->schib.pmcw.pnom);

	sch->lpm &= ~sch->schib.pmcw.pnom;
doverify:
	cdev->private->flags.doverify = 1;
}

/*
 * Copy valid bits from the extended control word to device irb.
 */
static void
ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
{
	/*
	 * Copy extended control bit if it is valid... yes there
	 * are condition that have to be met for the extended control
	 * bit to have meaning. Sick.
	 */
	cdev->private->irb.scsw.cmd.ectl = 0;
	if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
	    !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
		cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
	/* Check if extended control word is valid. */
	if (!cdev->private->irb.scsw.cmd.ectl)
		return;
	/* Copy concurrent sense / model dependent information. */
	memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
}

/*
 * Check if extended status word is valid.
 */
static int
ccw_device_accumulate_esw_valid(struct irb *irb)
{
	if (!irb->scsw.cmd.eswf &&
	    (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
		return 0;
	if (irb->scsw.cmd.stctl ==
			(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
	    !(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
		return 0;
	return 1;
}

/*
 * Copy valid bits from the extended status word to device irb.
 */
static void
ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
{
	struct irb *cdev_irb;
	struct sublog *cdev_sublog, *sublog;

	if (!ccw_device_accumulate_esw_valid(irb))
		return;

	cdev_irb = &cdev->private->irb;

	/* Copy last path used mask. */
	cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;

	/* Copy subchannel logout information if esw is of format 0. */
	if (irb->scsw.cmd.eswf) {
		cdev_sublog = &cdev_irb->esw.esw0.sublog;
		sublog = &irb->esw.esw0.sublog;
		/* Copy extended status flags. */
		cdev_sublog->esf = sublog->esf;
		/*
		 * Copy fields that have a meaning for channel data check
		 * channel control check and interface control check.
		 */
		if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK |
				       SCHN_STAT_CHN_CTRL_CHK |
				       SCHN_STAT_INTF_CTRL_CHK)) {
			/* Copy ancillary report bit. */
			cdev_sublog->arep = sublog->arep;
			/* Copy field-validity-flags. */
			cdev_sublog->fvf = sublog->fvf;
			/* Copy storage access code. */
			cdev_sublog->sacc = sublog->sacc;
			/* Copy termination code. */
			cdev_sublog->termc = sublog->termc;
			/* Copy sequence code. */
			cdev_sublog->seqc = sublog->seqc;
		}
		/* Copy device status check. */
		cdev_sublog->devsc = sublog->devsc;
		/* Copy secondary error. */
		cdev_sublog->serr = sublog->serr;
		/* Copy i/o-error alert. */
		cdev_sublog->ioerr = sublog->ioerr;
		/* Copy channel path timeout bit. */
		if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
			cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
		/* Copy failing storage address validity flag. */
		cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
		if (cdev_irb->esw.esw0.erw.fsavf) {
			/* ... and copy the failing storage address. */
			memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
			       sizeof (irb->esw.esw0.faddr));
			/* ... and copy the failing storage address format. */
			cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
		}
		/* Copy secondary ccw address validity bit. */
		cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
		if (irb->esw.esw0.erw.scavf)
			/* ... and copy the secondary ccw address. */
			cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
		
	}
	/* FIXME: DCTI for format 2? */

	/* Copy authorization bit. */
	cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
	/* Copy path verification required flag. */
	cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
	if (irb->esw.esw0.erw.pvrf)
		cdev->private->flags.doverify = 1;
	/* Copy concurrent sense bit. */
	cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
	if (irb->esw.esw0.erw.cons)
		cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
}

/*
 * Accumulate status from irb to devstat.
 */
void
ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
{
	struct irb *cdev_irb;

	/*
	 * Check if the status pending bit is set in stctl.
	 * If not, the remaining bit have no meaning and we must ignore them.
	 * The esw is not meaningful as well...
	 */
	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
		return;

	/* Check for channel checks and interface control checks. */
	ccw_device_msg_control_check(cdev, irb);

	/* Check for path not operational. */
	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
		ccw_device_path_notoper(cdev);
	/* No irb accumulation for transport mode irbs. */
	if (scsw_is_tm(&irb->scsw)) {
		memcpy(&cdev->private->irb, irb, sizeof(struct irb));
		return;
	}
	/*
	 * Don't accumulate unsolicited interrupts.
	 */
	if (!scsw_is_solicited(&irb->scsw))
		return;

	cdev_irb = &cdev->private->irb;

	/*
	 * If the clear function had been performed, all formerly pending
	 * status at the subchannel has been cleared and we must not pass
	 * intermediate accumulated status to the device driver.
	 */
	if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
		memset(&cdev->private->irb, 0, sizeof(struct irb));

	/* Copy bits which are valid only for the start function. */
	if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
		/* Copy key. */
		cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
		/* Copy suspend control bit. */
		cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
		/* Accumulate deferred condition code. */
		cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc;
		/* Copy ccw format bit. */
		cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
		/* Copy prefetch bit. */
		cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
		/* Copy initial-status-interruption-control. */
		cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
		/* Copy address limit checking control. */
		cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
		/* Copy suppress suspend bit. */
		cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
	}

	/* Take care of the extended control bit and extended control word. */
	ccw_device_accumulate_ecw(cdev, irb);
	    
	/* Accumulate function control. */
	cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl;
	/* Copy activity control. */
	cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
	/* Accumulate status control. */
	cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.stctl;
	/*
	 * Copy ccw address if it is valid. This is a bit simplified
	 * but should be close enough for all practical purposes.
	 */
	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) ||
	    ((irb->scsw.cmd.stctl ==
	      (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
	     (irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
	     (irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) ||
	    (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
		cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
	/* Accumulate device status, but not the device busy flag. */
	cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
	/* dstat is not always valid. */
	if (irb->scsw.cmd.stctl &
	    (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
	     | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
		cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat;
	/* Accumulate subchannel status. */
	cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat;
	/* Copy residual count if it is valid. */
	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
	    (irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN))
	     == 0)
		cdev_irb->scsw.cmd.count = irb->scsw.cmd.count;

	/* Take care of bits in the extended status word. */
	ccw_device_accumulate_esw(cdev, irb);

	/*
	 * Check whether we must issue a SENSE CCW ourselves if there is no
	 * concurrent sense facility installed for the subchannel.
	 * No sense is required if no delayed sense is pending
	 * and we did not get a unit check without sense information.
	 *
	 * Note: We should check for ioinfo[irq]->flags.consns but VM
	 *	 violates the ESA/390 architecture and doesn't present an
	 *	 operand exception for virtual devices without concurrent
	 *	 sense facility available/supported when enabling the
	 *	 concurrent sense facility.
	 */
	if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
	    !(cdev_irb->esw.esw0.erw.cons))
		cdev->private->flags.dosense = 1;
}

/*
 * Do a basic sense.
 */
int
ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
{
	struct subchannel *sch;
	struct ccw1 *sense_ccw;
	int rc;

	sch = to_subchannel(cdev->dev.parent);

	/* A sense is required, can we do it now ? */
	if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT))
		/*
		 * we received an Unit Check but we have no final
		 *  status yet, therefore we must delay the SENSE
		 *  processing. We must not report this intermediate
		 *  status to the device interrupt handler.
		 */
		return -EBUSY;

	/*
	 * We have ending status but no sense information. Do a basic sense.
	 */
	sense_ccw = &to_io_private(sch)->sense_ccw;
	sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
	sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
	sense_ccw->count = SENSE_MAX_COUNT;
	sense_ccw->flags = CCW_FLAG_SLI;

	rc = cio_start(sch, sense_ccw, 0xff);
	if (rc == -ENODEV || rc == -EACCES)
		dev_fsm_event(cdev, DEV_EVENT_VERIFY);
	return rc;
}

/*
 * Add information from basic sense to devstat.
 */
void
ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
{
	/*
	 * Check if the status pending bit is set in stctl.
	 * If not, the remaining bit have no meaning and we must ignore them.
	 * The esw is not meaningful as well...
	 */
	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
		return;

	/* Check for channel checks and interface control checks. */
	ccw_device_msg_control_check(cdev, irb);

	/* Check for path not operational. */
	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
		ccw_device_path_notoper(cdev);

	if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
	    (irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
		cdev->private->irb.esw.esw0.erw.cons = 1;
		cdev->private->flags.dosense = 0;
	}
	/* Check if path verification is required. */
	if (ccw_device_accumulate_esw_valid(irb) &&
	    irb->esw.esw0.erw.pvrf)
		cdev->private->flags.doverify = 1;
}

/*
 * This function accumulates the status into the private devstat and
 * starts a basic sense if one is needed.
 */
int
ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
{
	ccw_device_accumulate_irb(cdev, irb);
	if ((irb->scsw.cmd.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
		return -EBUSY;
	/* Check for basic sense. */
	if (cdev->private->flags.dosense &&
	    !(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
		cdev->private->irb.esw.esw0.erw.cons = 1;
		cdev->private->flags.dosense = 0;
		return 0;
	}
	if (cdev->private->flags.dosense) {
		ccw_device_do_sense(cdev, irb);
		return -EBUSY;
	}
	return 0;
}
Commit	Line	Data
1da177e4	1	/*
a53c8fab	2	* Copyright IBM Corp. 2002
4ce3b30c	3	* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4 LT	4	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	5	*
	6	* Status accumulation and basic sense functions.
	7	*/
	8
1da177e4 LT	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11
	12	#include <asm/ccwdev.h>
	13	#include <asm/cio.h>
	14
	15	#include "cio.h"
	16	#include "cio_debug.h"
	17	#include "css.h"
	18	#include "device.h"
	19	#include "ioasm.h"
cd6b4f27	20	#include "io_sch.h"
1da177e4 LT	21
	22	/*
	23	* Check for any kind of channel or interface control check but don't
	24	* issue the message for the console device
	25	*/
4d284cac	26	static void
1da177e4 LT	27	ccw_device_msg_control_check(struct ccw_device cdev, struct irb irb)
1da177e4 LT	28	{
7de6a63c	29	struct subchannel *sch = to_subchannel(cdev->dev.parent);
23d805b6 PO	30	char dbf_text[15];
	31
	32	if (!scsw_is_valid_cstat(&irb->scsw) \|\|
	33	!(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK \|
	34	SCHN_STAT_CHN_CTRL_CHK \| SCHN_STAT_INTF_CTRL_CHK)))
1da177e4	35	return;
1da177e4 LT	36	CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
1da177e4 LT	37	"received"
fb6958a5	38	" ... device %04x on subchannel 0.%x.%04x, dev_stat "
1da177e4	39	": %02X sch_stat : %02X\n",
7de6a63c SO	40	cdev->private->dev_id.devno, sch->schid.ssid,
7de6a63c SO	41	sch->schid.sch_no,
23d805b6	42	scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
7de6a63c	43	sprintf(dbf_text, "chk%x", sch->schid.sch_no);
23d805b6 PO	44	CIO_TRACE_EVENT(0, dbf_text);
23d805b6 PO	45	CIO_HEX_EVENT(0, irb, sizeof(struct irb));
1da177e4 LT	46	}
	47
	48	/*
	49	* Some paths became not operational (pno bit in scsw is set).
	50	*/
	51	static void
	52	ccw_device_path_notoper(struct ccw_device *cdev)
	53	{
	54	struct subchannel *sch;
	55
	56	sch = to_subchannel(cdev->dev.parent);
cdb912a4 SO	57	if (cio_update_schib(sch))
cdb912a4 SO	58	goto doverify;
1da177e4	59
fb6958a5	60	CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
2a2cf6b1	61	"not operational \n", __func__,
fb6958a5	62	sch->schid.ssid, sch->schid.sch_no,
1da177e4 LT	63	sch->schib.pmcw.pnom);
	64
	65	sch->lpm &= ~sch->schib.pmcw.pnom;
cdb912a4	66	doverify:
7e560814	67	cdev->private->flags.doverify = 1;
1da177e4 LT	68	}
	69
	70	/*
	71	* Copy valid bits from the extended control word to device irb.
	72	*/
4d284cac	73	static void
1da177e4 LT	74	ccw_device_accumulate_ecw(struct ccw_device cdev, struct irb irb)
	75	{
	76	/*
	77	* Copy extended control bit if it is valid... yes there
	78	* are condition that have to be met for the extended control
	79	* bit to have meaning. Sick.
	80	*/
23d805b6 PO	81	cdev->private->irb.scsw.cmd.ectl = 0;
	82	if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
	83	!(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
	84	cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
1da177e4	85	/* Check if extended control word is valid. */
23d805b6	86	if (!cdev->private->irb.scsw.cmd.ectl)
1da177e4 LT	87	return;
	88	/* Copy concurrent sense / model dependent information. */
	89	memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
	90	}
	91
	92	/*
	93	* Check if extended status word is valid.
	94	*/
4d284cac	95	static int
1da177e4 LT	96	ccw_device_accumulate_esw_valid(struct irb *irb)
1da177e4 LT	97	{
23d805b6 PO	98	if (!irb->scsw.cmd.eswf &&
23d805b6 PO	99	(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
1da177e4	100	return 0;
23d805b6 PO	101	if (irb->scsw.cmd.stctl ==
	102	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND) &&
	103	!(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
1da177e4 LT	104	return 0;
	105	return 1;
	106	}
	107
	108	/*
	109	* Copy valid bits from the extended status word to device irb.
	110	*/
4d284cac	111	static void
1da177e4 LT	112	ccw_device_accumulate_esw(struct ccw_device cdev, struct irb irb)
	113	{
	114	struct irb *cdev_irb;
	115	struct sublog cdev_sublog, sublog;
	116
	117	if (!ccw_device_accumulate_esw_valid(irb))
	118	return;
	119
	120	cdev_irb = &cdev->private->irb;
	121
	122	/* Copy last path used mask. */
	123	cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
	124
	125	/* Copy subchannel logout information if esw is of format 0. */
23d805b6	126	if (irb->scsw.cmd.eswf) {
1da177e4 LT	127	cdev_sublog = &cdev_irb->esw.esw0.sublog;
	128	sublog = &irb->esw.esw0.sublog;
	129	/* Copy extended status flags. */
	130	cdev_sublog->esf = sublog->esf;
	131	/*
	132	* Copy fields that have a meaning for channel data check
	133	* channel control check and interface control check.
	134	*/
23d805b6	135	if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK \|
1da177e4 LT	136	SCHN_STAT_CHN_CTRL_CHK \|
	137	SCHN_STAT_INTF_CTRL_CHK)) {
	138	/* Copy ancillary report bit. */
	139	cdev_sublog->arep = sublog->arep;
	140	/* Copy field-validity-flags. */
	141	cdev_sublog->fvf = sublog->fvf;
	142	/* Copy storage access code. */
	143	cdev_sublog->sacc = sublog->sacc;
	144	/* Copy termination code. */
	145	cdev_sublog->termc = sublog->termc;
	146	/* Copy sequence code. */
	147	cdev_sublog->seqc = sublog->seqc;
	148	}
	149	/* Copy device status check. */
	150	cdev_sublog->devsc = sublog->devsc;
	151	/* Copy secondary error. */
	152	cdev_sublog->serr = sublog->serr;
	153	/* Copy i/o-error alert. */
	154	cdev_sublog->ioerr = sublog->ioerr;
	155	/* Copy channel path timeout bit. */
23d805b6	156	if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
1da177e4 LT	157	cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
	158	/* Copy failing storage address validity flag. */
	159	cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
	160	if (cdev_irb->esw.esw0.erw.fsavf) {
	161	/* ... and copy the failing storage address. */
	162	memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
	163	sizeof (irb->esw.esw0.faddr));
	164	/* ... and copy the failing storage address format. */
	165	cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
	166	}
	167	/* Copy secondary ccw address validity bit. */
	168	cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
	169	if (irb->esw.esw0.erw.scavf)
	170	/* ... and copy the secondary ccw address. */
	171	cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
	172
	173	}
	174	/* FIXME: DCTI for format 2? */
	175
	176	/* Copy authorization bit. */
	177	cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
	178	/* Copy path verification required flag. */
	179	cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
7e560814	180	if (irb->esw.esw0.erw.pvrf)
1da177e4 LT	181	cdev->private->flags.doverify = 1;
	182	/* Copy concurrent sense bit. */
	183	cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
	184	if (irb->esw.esw0.erw.cons)
	185	cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
	186	}
	187
	188	/*
	189	* Accumulate status from irb to devstat.
	190	*/
	191	void
	192	ccw_device_accumulate_irb(struct ccw_device cdev, struct irb irb)
	193	{
	194	struct irb *cdev_irb;
	195
	196	/*
	197	* Check if the status pending bit is set in stctl.
	198	* If not, the remaining bit have no meaning and we must ignore them.
	199	* The esw is not meaningful as well...
	200	*/
23d805b6	201	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
1da177e4 LT	202	return;
	203
	204	/* Check for channel checks and interface control checks. */
	205	ccw_device_msg_control_check(cdev, irb);
	206
	207	/* Check for path not operational. */
23d805b6	208	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
1da177e4	209	ccw_device_path_notoper(cdev);
23d805b6 PO	210	/* No irb accumulation for transport mode irbs. */
	211	if (scsw_is_tm(&irb->scsw)) {
	212	memcpy(&cdev->private->irb, irb, sizeof(struct irb));
	213	return;
	214	}
1da177e4 LT	215	/*
	216	* Don't accumulate unsolicited interrupts.
	217	*/
23d805b6	218	if (!scsw_is_solicited(&irb->scsw))
1da177e4 LT	219	return;
	220
	221	cdev_irb = &cdev->private->irb;
	222
8c3ce5be CH	223	/*
	224	* If the clear function had been performed, all formerly pending
	225	* status at the subchannel has been cleared and we must not pass
	226	* intermediate accumulated status to the device driver.
	227	*/
23d805b6	228	if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
8c3ce5be CH	229	memset(&cdev->private->irb, 0, sizeof(struct irb));
8c3ce5be CH	230
1da177e4	231	/* Copy bits which are valid only for the start function. */
23d805b6	232	if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
1da177e4	233	/* Copy key. */
23d805b6	234	cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
1da177e4	235	/* Copy suspend control bit. */
23d805b6	236	cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
1da177e4	237	/* Accumulate deferred condition code. */
23d805b6	238	cdev_irb->scsw.cmd.cc \|= irb->scsw.cmd.cc;
1da177e4	239	/* Copy ccw format bit. */
23d805b6	240	cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
1da177e4	241	/* Copy prefetch bit. */
23d805b6	242	cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
1da177e4	243	/* Copy initial-status-interruption-control. */
23d805b6	244	cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
1da177e4	245	/* Copy address limit checking control. */
23d805b6	246	cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
1da177e4	247	/* Copy suppress suspend bit. */
23d805b6	248	cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
1da177e4 LT	249	}
	250
	251	/* Take care of the extended control bit and extended control word. */
	252	ccw_device_accumulate_ecw(cdev, irb);
	253
	254	/* Accumulate function control. */
23d805b6	255	cdev_irb->scsw.cmd.fctl \|= irb->scsw.cmd.fctl;
1da177e4	256	/* Copy activity control. */
23d805b6	257	cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
1da177e4	258	/* Accumulate status control. */
23d805b6	259	cdev_irb->scsw.cmd.stctl \|= irb->scsw.cmd.stctl;
1da177e4 LT	260	/*
	261	* Copy ccw address if it is valid. This is a bit simplified
	262	* but should be close enough for all practical purposes.
	263	*/
23d805b6 PO	264	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) \|\|
23d805b6 PO	265	((irb->scsw.cmd.stctl ==
1da177e4	266	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND)) &&
23d805b6 PO	267	(irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
	268	(irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) \|\|
	269	(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
	270	cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
1da177e4	271	/* Accumulate device status, but not the device busy flag. */
23d805b6	272	cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
25c61a1f	273	/* dstat is not always valid. */
23d805b6	274	if (irb->scsw.cmd.stctl &
25c61a1f CH	275	(SCSW_STCTL_PRIM_STATUS \| SCSW_STCTL_SEC_STATUS
25c61a1f CH	276	\| SCSW_STCTL_INTER_STATUS \| SCSW_STCTL_ALERT_STATUS))
23d805b6	277	cdev_irb->scsw.cmd.dstat \|= irb->scsw.cmd.dstat;
1da177e4	278	/* Accumulate subchannel status. */
23d805b6	279	cdev_irb->scsw.cmd.cstat \|= irb->scsw.cmd.cstat;
1da177e4	280	/* Copy residual count if it is valid. */
23d805b6 PO	281	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
	282	(irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI \| SCHN_STAT_INCORR_LEN))
	283	== 0)
	284	cdev_irb->scsw.cmd.count = irb->scsw.cmd.count;
1da177e4 LT	285
	286	/* Take care of bits in the extended status word. */
	287	ccw_device_accumulate_esw(cdev, irb);
	288
	289	/*
	290	* Check whether we must issue a SENSE CCW ourselves if there is no
	291	* concurrent sense facility installed for the subchannel.
	292	* No sense is required if no delayed sense is pending
	293	* and we did not get a unit check without sense information.
	294	*
	295	* Note: We should check for ioinfo[irq]->flags.consns but VM
	296	* violates the ESA/390 architecture and doesn't present an
	297	* operand exception for virtual devices without concurrent
	298	* sense facility available/supported when enabling the
	299	* concurrent sense facility.
	300	*/
23d805b6	301	if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1da177e4 LT	302	!(cdev_irb->esw.esw0.erw.cons))
	303	cdev->private->flags.dosense = 1;
	304	}
	305
	306	/*
	307	* Do a basic sense.
	308	*/
	309	int
	310	ccw_device_do_sense(struct ccw_device cdev, struct irb irb)
	311	{
	312	struct subchannel *sch;
cd6b4f27	313	struct ccw1 *sense_ccw;
fe6173d9	314	int rc;
1da177e4 LT	315
	316	sch = to_subchannel(cdev->dev.parent);
	317
	318	/* A sense is required, can we do it now ? */
23d805b6	319	if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT))
1da177e4 LT	320	/*
	321	* we received an Unit Check but we have no final
	322	* status yet, therefore we must delay the SENSE
	323	* processing. We must not report this intermediate
	324	* status to the device interrupt handler.
	325	*/
	326	return -EBUSY;
	327
	328	/*
	329	* We have ending status but no sense information. Do a basic sense.
	330	*/
cd6b4f27 CH	331	sense_ccw = &to_io_private(sch)->sense_ccw;
	332	sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
	333	sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
	334	sense_ccw->count = SENSE_MAX_COUNT;
	335	sense_ccw->flags = CCW_FLAG_SLI;
1da177e4	336
fe6173d9 CH	337	rc = cio_start(sch, sense_ccw, 0xff);
	338	if (rc == -ENODEV \|\| rc == -EACCES)
	339	dev_fsm_event(cdev, DEV_EVENT_VERIFY);
	340	return rc;
1da177e4 LT	341	}
	342
	343	/*
	344	* Add information from basic sense to devstat.
	345	*/
	346	void
	347	ccw_device_accumulate_basic_sense(struct ccw_device cdev, struct irb irb)
	348	{
	349	/*
	350	* Check if the status pending bit is set in stctl.
	351	* If not, the remaining bit have no meaning and we must ignore them.
	352	* The esw is not meaningful as well...
	353	*/
23d805b6	354	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
1da177e4 LT	355	return;
	356
	357	/* Check for channel checks and interface control checks. */
	358	ccw_device_msg_control_check(cdev, irb);
	359
	360	/* Check for path not operational. */
23d805b6	361	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
1da177e4 LT	362	ccw_device_path_notoper(cdev);
1da177e4 LT	363
23d805b6 PO	364	if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
23d805b6 PO	365	(irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
1da177e4 LT	366	cdev->private->irb.esw.esw0.erw.cons = 1;
	367	cdev->private->flags.dosense = 0;
	368	}
	369	/* Check if path verification is required. */
	370	if (ccw_device_accumulate_esw_valid(irb) &&
7e560814	371	irb->esw.esw0.erw.pvrf)
1da177e4 LT	372	cdev->private->flags.doverify = 1;
	373	}
	374
	375	/*
	376	* This function accumulates the status into the private devstat and
	377	* starts a basic sense if one is needed.
	378	*/
	379	int
	380	ccw_device_accumulate_and_sense(struct ccw_device cdev, struct irb irb)
	381	{
	382	ccw_device_accumulate_irb(cdev, irb);
23d805b6	383	if ((irb->scsw.cmd.actl & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT)) != 0)
1da177e4 LT	384	return -EBUSY;
	385	/* Check for basic sense. */
	386	if (cdev->private->flags.dosense &&
23d805b6	387	!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
1da177e4 LT	388	cdev->private->irb.esw.esw0.erw.cons = 1;
	389	cdev->private->flags.dosense = 0;
	390	return 0;
	391	}
	392	if (cdev->private->flags.dosense) {
	393	ccw_device_do_sense(cdev, irb);
	394	return -EBUSY;
	395	}
	396	return 0;
	397	}
	398